docs: def build_nodal_plane_dist(npd):
      """
      Returns the nodal plane distribution as a Node instance
  
      :param npd:
          Nodal plane distribution as instance of :class:
          `openquake.hazardlib.pmf.PMF`
      :returns:
          Instance of :class:`openquake.baselib.node.Node`
      """
      npds = []
      for prob, npd in npd.data:
          nodal_plane = Node(
              "nodalPlane", {"dip": npd.dip, "probability": prob,
                             "strike": npd.strike, "rake": npd.rake})
          npds.append(nodal_plane)
      return Node("nodalPlaneDist", nodes=npds)